MM1294 Просмотр технического описания (PDF) - Mitsumi

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MM1294

Protection of Lithium Ion Batteries (four cells in series)

Mitsumi 

MITSUMI

Protection of Lithium Ion Batteries (four cells in series) MM1294

Pin Description

Input/

Pin no. Pin name

output

1

OV Output

2

CS Input

3 DCHG Output

4

PF Output

5

CDC Input

6

COL Input

7

COV Input

8

GND Input

9

V1 Input

10

11

V2 Input

12

13

V3 Input

14

15

V4 Input

16

VCC Input

Function

Overcharge detection output pin

NPN transistor open collector output; normally high impedance, goes to L level on

overdischarge

Overcurrent detection pin

Monitors equivalent load current through source-drain voltage drop of discharge-controlling

FET, and at or above the overcurrent detection voltage sets the DCHG pin to "H" and turns

off the discharge-controlling FET. Following overcurrent detection, current is passed from

this pin, and if the load is decreased, the overcurrent mode is canceled. Through this action

there is a temporary consumption current (at the VCC pin) of approx. 1 mA on resumption of

discharge and detection of overdischarge. This function is disabled in overdischarge mode.

Pin driving the discharge-controlling FET (P-ch)

Normally "L"; on overdischarge set to "H"

Output pin for overdischarge detection signals

Overdischarge detection signal output pin

When the overdischarge detector detects overdischarge at the open collector output

of the NPN transistor, this pin is turned on. A delay is provided by setting a dead

time until discharge ends, so that by utilizing a reset or other signal from a CPU or

some other controlling device, the equipment can be put into standby mode.

Pin to set the dead time for overdischarge detection

By connecting a capacitor between the CDC pin and GND, a dead time can be set.

Pin to set the dead time for overcurrent detection

By connecting a capacitor between the COL pin and GND, a dead time can be set.

If NC, protection is triggered in a short amount of time; the dead time should be

set according to the application.

Pin to set the dead time for overcharge detection

By connecting a capacitor between the COV pin and GND, a dead time can be set.

Ground pin

Pin for input of V1 cell high-side voltage and V2 cell low-side voltage

N.C

Pin for input of V2 cell high-side voltage and V3 cell low-side voltage

N.C

Pin for input of V3 cell high-side voltage and V4 cell low-side voltage

N.C

Pin for input of V4 cell high-side voltage

Power supply input pin

The same potential as the V4 pin should be input

Absolute Maximun Ratings (Ta=25°C)

Item

Storage temperature

Operating temperature

Charge voltage

Power supply voltage

Voltage applied to OV pin

Allowable loss

Symbol

TSTG

TOPR

VV4 max.

VCC max.

VOV max.

Pd

Ratings

-40~+125

-20~+70

24

24

24

300

Units

°C

°C

V

V

V

mW

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